Android password visibility toggle not working with support library 25?

Try it this way.

<android.support.design.widget.TextInputLayout
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   app:passwordToggleEnabled="true">

<EditText
    android:id="@+id/returning_password"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/prompt_password"
    android:inputType="textPassword"
    android:maxLines="1"
    android:textSize="14sp" />

</android.support.design.widget.TextInputLayout>

This might be helpful for you!!

The TextInputLayout password toggle is now disabled by default to avoid unnecessarily overwriting developer-specified end drawables. It may be manually enabled via the passwordToggleEnabled XML attribute.

Recent Support Library Revisions

if you use Jetpack then

add these dependencies

implementation 'com.google.android.material:material:1.0.0'

and add app:passwordToggleEnabled="true" in xml and one more thing, use inputType= textPassword and if you use rather than this then toggle button won't be shown.

Instead of using

<android.support.design.widget.TextInputLayout
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   app:passwordToggleEnabled="true">

<EditText
    android:id="@+id/returning_password"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/prompt_password"
    android:inputType="textPassword"
    android:maxLines="1"
    android:textSize="14sp" />

</android.support.design.widget.TextInputLayout>

, you need to use

<com.google.android.material.textfield.TextInputLayout
 android:layout_width="match_parent"
   android:layout_height="wrap_content"
   app:passwordToggleEnabled="true">

<EditText
    android:id="@+id/returning_password"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/prompt_password"
    android:inputType="textPassword"
    android:maxLines="1"
    android:textSize="14sp" />

</com.google.android.material.textfield.TextInputLayout>